1: In general use that set up after a kill or when you do seismo XX focus on a cornered opponent, but the part that works out the best for me is summon Jam session then shortly afterward start focus, be ready to cancel with dash into super jump in case the enemy takes the hit so you can follow up.
2: My default air throw combo for that team is:
Air throw ,-/, A+B, 623A 28, 6A+B, C xx 214A~S, C, S -/, C xx 236C~S, 9, B, B, C, 9, B, C, S xx 214S -/ C, S /-\ C, 9, C, S -/ (summon jam session) 623A xx 62369A xx 62369A xx 2147C -/ xx 214A+B DHC 214A+B, 28 S, 3CCC, 6C xx A+S, S, (summon Haggar) 623B, (haggar hits) 9, S, 623B623B, 6C xx A+S xx 214C xx C, if on Wesker depending on your starting gauge use million dollars to kill. No matter where you are on screen if you throw toward the corner the additional section in the box loop-esque area moves them far enough horizontally to bring them there. You should Kill most important characters like Wolverine off the throw.
4: (I don’t know where I missed 3 X_X) Unblockable with flame kick:
This is mainly useful if you have Acid rain on someone coming in and you have time to just time it normally, I normally try to hit with 2B at the same time as burn kick since its range and ability to follow up regardless of what technically hits second is best. Alternative hysteric XX devil trigger, Air trick, C+Viper land 2B. Depending on enemy familiarity this is an incredibly scary set up. As for following up going with crouch B for the low lets you always go straight into stand C for either cold shower or weasel shot to set up high damage follow ups you will always be able to go into stand C there, and if you mistimed it enough that they manage to block you get to go into stinger xx bold cancel reverb shock fireworks.
5: Keep away against Viper
Taskmaster Doctor Doom and Dorm are all kind of free when doing keep away against Viper, seismic hammer beats the start up of all of their ground zoning tools and Task’s air angled arrows. Dorm is going to get much harder in Ultimate but as of now if you spam seismo he has a terrible time fighting Viper, if you have 2 gauges if he resorts to chaotic flame you get to Emergency combination XX devil trigger since it eats the entire chaotic flame blast. As for assists who are better at helping you control space the top 2 for me are Magneto since he’s also the third best point character in the game along with a really fast horizontal assist, or Akuma since tatsu eats so many things. Characters who have zoning which gives Viper the biggest issue are Phoenix, Trish, and Zero since they don’t get bodied for free by seismo if they control space from the air.
Hope that helps with all your questions!